1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Driver for the Conexant CX25821 PCIe bridge
4 *
5 * Copyright (C) 2009 Conexant Systems Inc.
6 * Authors <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
7 * Based on SAA713x ALSA driver and CX88 driver
8 */
9
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/device.h>
15 #include <linux/interrupt.h>
16 #include <linux/vmalloc.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/pci.h>
19 #include <linux/slab.h>
20
21 #include <linux/delay.h>
22 #include <sound/core.h>
23 #include <sound/pcm.h>
24 #include <sound/pcm_params.h>
25 #include <sound/control.h>
26 #include <sound/initval.h>
27 #include <sound/tlv.h>
28
29 #include "cx25821.h"
30 #include "cx25821-reg.h"
31
32 #define AUDIO_SRAM_CHANNEL SRAM_CH08
33
34 #define dprintk(level, fmt, arg...) \
35 do { \
36 if (debug >= level) \
37 pr_info("%s/1: " fmt, chip->dev->name, ##arg); \
38 } while (0)
39 #define dprintk_core(level, fmt, arg...) \
40 do { \
41 if (debug >= level) \
42 printk(KERN_DEBUG "%s/1: " fmt, chip->dev->name, ##arg); \
43 } while (0)
44
45 /****************************************************************************
46 Data type declarations - Can be moded to a header file later
47 ****************************************************************************/
48
49 static int devno;
50
51 struct cx25821_audio_buffer {
52 unsigned int bpl;
53 struct cx25821_riscmem risc;
54 void *vaddr;
55 struct scatterlist *sglist;
56 int sglen;
57 int nr_pages;
58 };
59
60 struct cx25821_audio_dev {
61 struct cx25821_dev *dev;
62 struct cx25821_dmaqueue q;
63
64 /* pci i/o */
65 struct pci_dev *pci;
66
67 /* audio controls */
68 int irq;
69
70 struct snd_card *card;
71
72 unsigned long iobase;
73 spinlock_t reg_lock;
74 atomic_t count;
75
76 unsigned int dma_size;
77 unsigned int period_size;
78 unsigned int num_periods;
79
80 struct cx25821_audio_buffer *buf;
81
82 struct snd_pcm_substream *substream;
83 };
84
85
86 /****************************************************************************
87 Module global static vars
88 ****************************************************************************/
89
90 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
91 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
92 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
93
94 module_param_array(enable, bool, NULL, 0444);
95 MODULE_PARM_DESC(enable, "Enable cx25821 soundcard. default enabled.");
96
97 module_param_array(index, int, NULL, 0444);
98 MODULE_PARM_DESC(index, "Index value for cx25821 capture interface(s).");
99
100 /****************************************************************************
101 Module macros
102 ****************************************************************************/
103
104 MODULE_DESCRIPTION("ALSA driver module for cx25821 based capture cards");
105 MODULE_AUTHOR("Hiep Huynh");
106 MODULE_LICENSE("GPL");
107 MODULE_SUPPORTED_DEVICE("{{Conexant,25821}"); /* "{{Conexant,23881}," */
108
109 static unsigned int debug;
110 module_param(debug, int, 0644);
111 MODULE_PARM_DESC(debug, "enable debug messages");
112
113 /****************************************************************************
114 Module specific functions
115 ****************************************************************************/
116 /* Constants taken from cx88-reg.h */
117 #define AUD_INT_DN_RISCI1 (1 << 0)
118 #define AUD_INT_UP_RISCI1 (1 << 1)
119 #define AUD_INT_RDS_DN_RISCI1 (1 << 2)
120 #define AUD_INT_DN_RISCI2 (1 << 4) /* yes, 3 is skipped */
121 #define AUD_INT_UP_RISCI2 (1 << 5)
122 #define AUD_INT_RDS_DN_RISCI2 (1 << 6)
123 #define AUD_INT_DN_SYNC (1 << 12)
124 #define AUD_INT_UP_SYNC (1 << 13)
125 #define AUD_INT_RDS_DN_SYNC (1 << 14)
126 #define AUD_INT_OPC_ERR (1 << 16)
127 #define AUD_INT_BER_IRQ (1 << 20)
128 #define AUD_INT_MCHG_IRQ (1 << 21)
129 #define GP_COUNT_CONTROL_RESET 0x3
130
131 #define PCI_MSK_AUD_EXT (1 << 4)
132 #define PCI_MSK_AUD_INT (1 << 3)
133
cx25821_alsa_dma_init(struct cx25821_audio_dev * chip,int nr_pages)134 static int cx25821_alsa_dma_init(struct cx25821_audio_dev *chip, int nr_pages)
135 {
136 struct cx25821_audio_buffer *buf = chip->buf;
137 struct page *pg;
138 int i;
139
140 buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
141 if (NULL == buf->vaddr) {
142 dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages);
143 return -ENOMEM;
144 }
145
146 dprintk(1, "vmalloc is at addr 0x%p, size=%d\n",
147 buf->vaddr,
148 nr_pages << PAGE_SHIFT);
149
150 memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT);
151 buf->nr_pages = nr_pages;
152
153 buf->sglist = vzalloc(array_size(sizeof(*buf->sglist), buf->nr_pages));
154 if (NULL == buf->sglist)
155 goto vzalloc_err;
156
157 sg_init_table(buf->sglist, buf->nr_pages);
158 for (i = 0; i < buf->nr_pages; i++) {
159 pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE);
160 if (NULL == pg)
161 goto vmalloc_to_page_err;
162 sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0);
163 }
164 return 0;
165
166 vmalloc_to_page_err:
167 vfree(buf->sglist);
168 buf->sglist = NULL;
169 vzalloc_err:
170 vfree(buf->vaddr);
171 buf->vaddr = NULL;
172 return -ENOMEM;
173 }
174
cx25821_alsa_dma_map(struct cx25821_audio_dev * dev)175 static int cx25821_alsa_dma_map(struct cx25821_audio_dev *dev)
176 {
177 struct cx25821_audio_buffer *buf = dev->buf;
178
179 buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist,
180 buf->nr_pages, PCI_DMA_FROMDEVICE);
181
182 if (0 == buf->sglen) {
183 pr_warn("%s: cx25821_alsa_map_sg failed\n", __func__);
184 return -ENOMEM;
185 }
186 return 0;
187 }
188
cx25821_alsa_dma_unmap(struct cx25821_audio_dev * dev)189 static int cx25821_alsa_dma_unmap(struct cx25821_audio_dev *dev)
190 {
191 struct cx25821_audio_buffer *buf = dev->buf;
192
193 if (!buf->sglen)
194 return 0;
195
196 dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->sglen, PCI_DMA_FROMDEVICE);
197 buf->sglen = 0;
198 return 0;
199 }
200
cx25821_alsa_dma_free(struct cx25821_audio_buffer * buf)201 static int cx25821_alsa_dma_free(struct cx25821_audio_buffer *buf)
202 {
203 vfree(buf->sglist);
204 buf->sglist = NULL;
205 vfree(buf->vaddr);
206 buf->vaddr = NULL;
207 return 0;
208 }
209
210 /*
211 * BOARD Specific: Sets audio DMA
212 */
213
_cx25821_start_audio_dma(struct cx25821_audio_dev * chip)214 static int _cx25821_start_audio_dma(struct cx25821_audio_dev *chip)
215 {
216 struct cx25821_audio_buffer *buf = chip->buf;
217 struct cx25821_dev *dev = chip->dev;
218 const struct sram_channel *audio_ch =
219 &cx25821_sram_channels[AUDIO_SRAM_CHANNEL];
220 u32 tmp = 0;
221
222 /* enable output on the GPIO 0 for the MCLK ADC (Audio) */
223 cx25821_set_gpiopin_direction(chip->dev, 0, 0);
224
225 /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
226 cx_clear(AUD_INT_DMA_CTL,
227 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
228
229 /* setup fifo + format - out channel */
230 cx25821_sram_channel_setup_audio(chip->dev, audio_ch, buf->bpl,
231 buf->risc.dma);
232
233 /* sets bpl size */
234 cx_write(AUD_A_LNGTH, buf->bpl);
235
236 /* reset counter */
237 /* GP_COUNT_CONTROL_RESET = 0x3 */
238 cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
239 atomic_set(&chip->count, 0);
240
241 /* Set the input mode to 16-bit */
242 tmp = cx_read(AUD_A_CFG);
243 cx_write(AUD_A_CFG, tmp | FLD_AUD_DST_PK_MODE | FLD_AUD_DST_ENABLE |
244 FLD_AUD_CLK_ENABLE);
245
246 /*
247 pr_info("DEBUG: Start audio DMA, %d B/line, cmds_start(0x%x)= %d lines/FIFO, %d periods, %d byte buffer\n",
248 buf->bpl, audio_ch->cmds_start,
249 cx_read(audio_ch->cmds_start + 12)>>1,
250 chip->num_periods, buf->bpl * chip->num_periods);
251 */
252
253 /* Enables corresponding bits at AUD_INT_STAT */
254 cx_write(AUD_A_INT_MSK, FLD_AUD_DST_RISCI1 | FLD_AUD_DST_OF |
255 FLD_AUD_DST_SYNC | FLD_AUD_DST_OPC_ERR);
256
257 /* Clean any pending interrupt bits already set */
258 cx_write(AUD_A_INT_STAT, ~0);
259
260 /* enable audio irqs */
261 cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
262
263 /* Turn on audio downstream fifo and risc enable 0x101 */
264 tmp = cx_read(AUD_INT_DMA_CTL);
265 cx_set(AUD_INT_DMA_CTL, tmp |
266 (FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN));
267
268 mdelay(100);
269 return 0;
270 }
271
272 /*
273 * BOARD Specific: Resets audio DMA
274 */
_cx25821_stop_audio_dma(struct cx25821_audio_dev * chip)275 static int _cx25821_stop_audio_dma(struct cx25821_audio_dev *chip)
276 {
277 struct cx25821_dev *dev = chip->dev;
278
279 /* stop dma */
280 cx_clear(AUD_INT_DMA_CTL,
281 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
282
283 /* disable irqs */
284 cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
285 cx_clear(AUD_A_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
286 AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1);
287
288 return 0;
289 }
290
291 #define MAX_IRQ_LOOP 50
292
293 /*
294 * BOARD Specific: IRQ dma bits
295 */
296 static char *cx25821_aud_irqs[32] = {
297 "dn_risci1", "up_risci1", "rds_dn_risc1", /* 0-2 */
298 NULL, /* reserved */
299 "dn_risci2", "up_risci2", "rds_dn_risc2", /* 4-6 */
300 NULL, /* reserved */
301 "dnf_of", "upf_uf", "rds_dnf_uf", /* 8-10 */
302 NULL, /* reserved */
303 "dn_sync", "up_sync", "rds_dn_sync", /* 12-14 */
304 NULL, /* reserved */
305 "opc_err", "par_err", "rip_err", /* 16-18 */
306 "pci_abort", "ber_irq", "mchg_irq" /* 19-21 */
307 };
308
309 /*
310 * BOARD Specific: Threats IRQ audio specific calls
311 */
cx25821_aud_irq(struct cx25821_audio_dev * chip,u32 status,u32 mask)312 static void cx25821_aud_irq(struct cx25821_audio_dev *chip, u32 status,
313 u32 mask)
314 {
315 struct cx25821_dev *dev = chip->dev;
316
317 if (0 == (status & mask))
318 return;
319
320 cx_write(AUD_A_INT_STAT, status);
321 if (debug > 1 || (status & mask & ~0xff))
322 cx25821_print_irqbits(dev->name, "irq aud", cx25821_aud_irqs,
323 ARRAY_SIZE(cx25821_aud_irqs), status, mask);
324
325 /* risc op code error */
326 if (status & AUD_INT_OPC_ERR) {
327 pr_warn("WARNING %s/1: Audio risc op code error\n", dev->name);
328
329 cx_clear(AUD_INT_DMA_CTL,
330 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
331 cx25821_sram_channel_dump_audio(dev,
332 &cx25821_sram_channels[AUDIO_SRAM_CHANNEL]);
333 }
334 if (status & AUD_INT_DN_SYNC) {
335 pr_warn("WARNING %s: Downstream sync error!\n", dev->name);
336 cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
337 return;
338 }
339
340 /* risc1 downstream */
341 if (status & AUD_INT_DN_RISCI1) {
342 atomic_set(&chip->count, cx_read(AUD_A_GPCNT));
343 snd_pcm_period_elapsed(chip->substream);
344 }
345 }
346
347 /*
348 * BOARD Specific: Handles IRQ calls
349 */
cx25821_irq(int irq,void * dev_id)350 static irqreturn_t cx25821_irq(int irq, void *dev_id)
351 {
352 struct cx25821_audio_dev *chip = dev_id;
353 struct cx25821_dev *dev = chip->dev;
354 u32 status, pci_status;
355 u32 audint_status, audint_mask;
356 int loop, handled = 0;
357
358 audint_status = cx_read(AUD_A_INT_STAT);
359 audint_mask = cx_read(AUD_A_INT_MSK);
360 status = cx_read(PCI_INT_STAT);
361
362 for (loop = 0; loop < 1; loop++) {
363 status = cx_read(PCI_INT_STAT);
364 if (0 == status) {
365 status = cx_read(PCI_INT_STAT);
366 audint_status = cx_read(AUD_A_INT_STAT);
367 audint_mask = cx_read(AUD_A_INT_MSK);
368
369 if (status) {
370 handled = 1;
371 cx_write(PCI_INT_STAT, status);
372
373 cx25821_aud_irq(chip, audint_status,
374 audint_mask);
375 break;
376 } else {
377 goto out;
378 }
379 }
380
381 handled = 1;
382 cx_write(PCI_INT_STAT, status);
383
384 cx25821_aud_irq(chip, audint_status, audint_mask);
385 }
386
387 pci_status = cx_read(PCI_INT_STAT);
388
389 if (handled)
390 cx_write(PCI_INT_STAT, pci_status);
391
392 out:
393 return IRQ_RETVAL(handled);
394 }
395
dsp_buffer_free(struct cx25821_audio_dev * chip)396 static int dsp_buffer_free(struct cx25821_audio_dev *chip)
397 {
398 struct cx25821_riscmem *risc = &chip->buf->risc;
399
400 BUG_ON(!chip->dma_size);
401
402 dprintk(2, "Freeing buffer\n");
403 cx25821_alsa_dma_unmap(chip);
404 cx25821_alsa_dma_free(chip->buf);
405 pci_free_consistent(chip->pci, risc->size, risc->cpu, risc->dma);
406 kfree(chip->buf);
407
408 chip->buf = NULL;
409 chip->dma_size = 0;
410
411 return 0;
412 }
413
414 /****************************************************************************
415 ALSA PCM Interface
416 ****************************************************************************/
417
418 /*
419 * Digital hardware definition
420 */
421 #define DEFAULT_FIFO_SIZE 384
422 static const struct snd_pcm_hardware snd_cx25821_digital_hw = {
423 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
424 SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID,
425 .formats = SNDRV_PCM_FMTBIT_S16_LE,
426
427 .rates = SNDRV_PCM_RATE_48000,
428 .rate_min = 48000,
429 .rate_max = 48000,
430 .channels_min = 2,
431 .channels_max = 2,
432 /* Analog audio output will be full of clicks and pops if there
433 are not exactly four lines in the SRAM FIFO buffer. */
434 .period_bytes_min = DEFAULT_FIFO_SIZE / 3,
435 .period_bytes_max = DEFAULT_FIFO_SIZE / 3,
436 .periods_min = 1,
437 .periods_max = AUDIO_LINE_SIZE,
438 /* 128 * 128 = 16384 = 1024 * 16 */
439 .buffer_bytes_max = (AUDIO_LINE_SIZE * AUDIO_LINE_SIZE),
440 };
441
442 /*
443 * audio pcm capture open callback
444 */
snd_cx25821_pcm_open(struct snd_pcm_substream * substream)445 static int snd_cx25821_pcm_open(struct snd_pcm_substream *substream)
446 {
447 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
448 struct snd_pcm_runtime *runtime = substream->runtime;
449 int err;
450 unsigned int bpl = 0;
451
452 if (!chip) {
453 pr_err("DEBUG: cx25821 can't find device struct. Can't proceed with open\n");
454 return -ENODEV;
455 }
456
457 err = snd_pcm_hw_constraint_pow2(runtime, 0,
458 SNDRV_PCM_HW_PARAM_PERIODS);
459 if (err < 0)
460 goto _error;
461
462 chip->substream = substream;
463
464 runtime->hw = snd_cx25821_digital_hw;
465
466 if (cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
467 DEFAULT_FIFO_SIZE) {
468 /* since there are 3 audio Clusters */
469 bpl = cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 3;
470 bpl &= ~7; /* must be multiple of 8 */
471
472 if (bpl > AUDIO_LINE_SIZE)
473 bpl = AUDIO_LINE_SIZE;
474
475 runtime->hw.period_bytes_min = bpl;
476 runtime->hw.period_bytes_max = bpl;
477 }
478
479 return 0;
480 _error:
481 dprintk(1, "Error opening PCM!\n");
482 return err;
483 }
484
485 /*
486 * audio close callback
487 */
snd_cx25821_close(struct snd_pcm_substream * substream)488 static int snd_cx25821_close(struct snd_pcm_substream *substream)
489 {
490 return 0;
491 }
492
493 /*
494 * hw_params callback
495 */
snd_cx25821_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)496 static int snd_cx25821_hw_params(struct snd_pcm_substream *substream,
497 struct snd_pcm_hw_params *hw_params)
498 {
499 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
500 struct cx25821_audio_buffer *buf;
501 int ret;
502
503 if (substream->runtime->dma_area) {
504 dsp_buffer_free(chip);
505 substream->runtime->dma_area = NULL;
506 }
507
508 chip->period_size = params_period_bytes(hw_params);
509 chip->num_periods = params_periods(hw_params);
510 chip->dma_size = chip->period_size * params_periods(hw_params);
511
512 BUG_ON(!chip->dma_size);
513 BUG_ON(chip->num_periods & (chip->num_periods - 1));
514
515 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
516 if (NULL == buf)
517 return -ENOMEM;
518
519 if (chip->period_size > AUDIO_LINE_SIZE)
520 chip->period_size = AUDIO_LINE_SIZE;
521
522 buf->bpl = chip->period_size;
523 chip->buf = buf;
524
525 ret = cx25821_alsa_dma_init(chip,
526 (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
527 if (ret < 0)
528 goto error;
529
530 ret = cx25821_alsa_dma_map(chip);
531 if (ret < 0)
532 goto error;
533
534 ret = cx25821_risc_databuffer_audio(chip->pci, &buf->risc, buf->sglist,
535 chip->period_size, chip->num_periods, 1);
536 if (ret < 0) {
537 pr_info("DEBUG: ERROR after cx25821_risc_databuffer_audio()\n");
538 goto error;
539 }
540
541 /* Loop back to start of program */
542 buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
543 buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
544 buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
545
546 substream->runtime->dma_area = chip->buf->vaddr;
547 substream->runtime->dma_bytes = chip->dma_size;
548 substream->runtime->dma_addr = 0;
549
550 return 0;
551
552 error:
553 chip->buf = NULL;
554 kfree(buf);
555 return ret;
556 }
557
558 /*
559 * hw free callback
560 */
snd_cx25821_hw_free(struct snd_pcm_substream * substream)561 static int snd_cx25821_hw_free(struct snd_pcm_substream *substream)
562 {
563 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
564
565 if (substream->runtime->dma_area) {
566 dsp_buffer_free(chip);
567 substream->runtime->dma_area = NULL;
568 }
569
570 return 0;
571 }
572
573 /*
574 * prepare callback
575 */
snd_cx25821_prepare(struct snd_pcm_substream * substream)576 static int snd_cx25821_prepare(struct snd_pcm_substream *substream)
577 {
578 return 0;
579 }
580
581 /*
582 * trigger callback
583 */
snd_cx25821_card_trigger(struct snd_pcm_substream * substream,int cmd)584 static int snd_cx25821_card_trigger(struct snd_pcm_substream *substream,
585 int cmd)
586 {
587 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
588 int err = 0;
589
590 /* Local interrupts are already disabled by ALSA */
591 spin_lock(&chip->reg_lock);
592
593 switch (cmd) {
594 case SNDRV_PCM_TRIGGER_START:
595 err = _cx25821_start_audio_dma(chip);
596 break;
597 case SNDRV_PCM_TRIGGER_STOP:
598 err = _cx25821_stop_audio_dma(chip);
599 break;
600 default:
601 err = -EINVAL;
602 break;
603 }
604
605 spin_unlock(&chip->reg_lock);
606
607 return err;
608 }
609
610 /*
611 * pointer callback
612 */
snd_cx25821_pointer(struct snd_pcm_substream * substream)613 static snd_pcm_uframes_t snd_cx25821_pointer(struct snd_pcm_substream
614 *substream)
615 {
616 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
617 struct snd_pcm_runtime *runtime = substream->runtime;
618 u16 count;
619
620 count = atomic_read(&chip->count);
621
622 return runtime->period_size * (count & (runtime->periods - 1));
623 }
624
625 /*
626 * page callback (needed for mmap)
627 */
snd_cx25821_page(struct snd_pcm_substream * substream,unsigned long offset)628 static struct page *snd_cx25821_page(struct snd_pcm_substream *substream,
629 unsigned long offset)
630 {
631 void *pageptr = substream->runtime->dma_area + offset;
632
633 return vmalloc_to_page(pageptr);
634 }
635
636 /*
637 * operators
638 */
639 static const struct snd_pcm_ops snd_cx25821_pcm_ops = {
640 .open = snd_cx25821_pcm_open,
641 .close = snd_cx25821_close,
642 .ioctl = snd_pcm_lib_ioctl,
643 .hw_params = snd_cx25821_hw_params,
644 .hw_free = snd_cx25821_hw_free,
645 .prepare = snd_cx25821_prepare,
646 .trigger = snd_cx25821_card_trigger,
647 .pointer = snd_cx25821_pointer,
648 .page = snd_cx25821_page,
649 };
650
651 /*
652 * ALSA create a PCM device: Called when initializing the board.
653 * Sets up the name and hooks up the callbacks
654 */
snd_cx25821_pcm(struct cx25821_audio_dev * chip,int device,char * name)655 static int snd_cx25821_pcm(struct cx25821_audio_dev *chip, int device,
656 char *name)
657 {
658 struct snd_pcm *pcm;
659 int err;
660
661 err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
662 if (err < 0) {
663 pr_info("ERROR: FAILED snd_pcm_new() in %s\n", __func__);
664 return err;
665 }
666 pcm->private_data = chip;
667 pcm->info_flags = 0;
668 strscpy(pcm->name, name, sizeof(pcm->name));
669 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx25821_pcm_ops);
670
671 return 0;
672 }
673
674 /****************************************************************************
675 Basic Flow for Sound Devices
676 ****************************************************************************/
677
678 /*
679 * PCI ID Table - 14f1:8801 and 14f1:8811 means function 1: Audio
680 * Only boards with eeprom and byte 1 at eeprom=1 have it
681 */
682
683 static const struct pci_device_id __maybe_unused cx25821_audio_pci_tbl[] = {
684 {0x14f1, 0x0920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
685 {0,}
686 };
687
688 MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl);
689
690 /*
691 * Alsa Constructor - Component probe
692 */
cx25821_audio_initdev(struct cx25821_dev * dev)693 static int cx25821_audio_initdev(struct cx25821_dev *dev)
694 {
695 struct snd_card *card;
696 struct cx25821_audio_dev *chip;
697 int err;
698
699 if (devno >= SNDRV_CARDS) {
700 pr_info("DEBUG ERROR: devno >= SNDRV_CARDS %s\n", __func__);
701 return -ENODEV;
702 }
703
704 if (!enable[devno]) {
705 ++devno;
706 pr_info("DEBUG ERROR: !enable[devno] %s\n", __func__);
707 return -ENOENT;
708 }
709
710 err = snd_card_new(&dev->pci->dev, index[devno], id[devno],
711 THIS_MODULE,
712 sizeof(struct cx25821_audio_dev), &card);
713 if (err < 0) {
714 pr_info("DEBUG ERROR: cannot create snd_card_new in %s\n",
715 __func__);
716 return err;
717 }
718
719 strscpy(card->driver, "cx25821", sizeof(card->driver));
720
721 /* Card "creation" */
722 chip = card->private_data;
723 spin_lock_init(&chip->reg_lock);
724
725 chip->dev = dev;
726 chip->card = card;
727 chip->pci = dev->pci;
728 chip->iobase = pci_resource_start(dev->pci, 0);
729
730 chip->irq = dev->pci->irq;
731
732 err = request_irq(dev->pci->irq, cx25821_irq,
733 IRQF_SHARED, chip->dev->name, chip);
734
735 if (err < 0) {
736 pr_err("ERROR %s: can't get IRQ %d for ALSA\n", chip->dev->name,
737 dev->pci->irq);
738 goto error;
739 }
740
741 err = snd_cx25821_pcm(chip, 0, "cx25821 Digital");
742 if (err < 0) {
743 pr_info("DEBUG ERROR: cannot create snd_cx25821_pcm %s\n",
744 __func__);
745 goto error;
746 }
747
748 strscpy(card->shortname, "cx25821", sizeof(card->shortname));
749 sprintf(card->longname, "%s at 0x%lx irq %d", chip->dev->name,
750 chip->iobase, chip->irq);
751 strscpy(card->mixername, "CX25821", sizeof(card->mixername));
752
753 pr_info("%s/%i: ALSA support for cx25821 boards\n", card->driver,
754 devno);
755
756 err = snd_card_register(card);
757 if (err < 0) {
758 pr_info("DEBUG ERROR: cannot register sound card %s\n",
759 __func__);
760 goto error;
761 }
762
763 dev->card = card;
764 devno++;
765 return 0;
766
767 error:
768 snd_card_free(card);
769 return err;
770 }
771
772 /****************************************************************************
773 LINUX MODULE INIT
774 ****************************************************************************/
775
cx25821_alsa_exit_callback(struct device * dev,void * data)776 static int cx25821_alsa_exit_callback(struct device *dev, void *data)
777 {
778 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
779 struct cx25821_dev *cxdev = get_cx25821(v4l2_dev);
780
781 snd_card_free(cxdev->card);
782 return 0;
783 }
784
cx25821_audio_fini(void)785 static void cx25821_audio_fini(void)
786 {
787 struct device_driver *drv = driver_find("cx25821", &pci_bus_type);
788 int ret;
789
790 ret = driver_for_each_device(drv, NULL, NULL, cx25821_alsa_exit_callback);
791 if (ret)
792 pr_err("%s failed to find a cx25821 driver.\n", __func__);
793 }
794
cx25821_alsa_init_callback(struct device * dev,void * data)795 static int cx25821_alsa_init_callback(struct device *dev, void *data)
796 {
797 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
798 struct cx25821_dev *cxdev = get_cx25821(v4l2_dev);
799
800 cx25821_audio_initdev(cxdev);
801 return 0;
802 }
803
804 /*
805 * Module initializer
806 *
807 * Loops through present saa7134 cards, and assigns an ALSA device
808 * to each one
809 *
810 */
cx25821_alsa_init(void)811 static int cx25821_alsa_init(void)
812 {
813 struct device_driver *drv = driver_find("cx25821", &pci_bus_type);
814
815 return driver_for_each_device(drv, NULL, NULL, cx25821_alsa_init_callback);
816
817 }
818
819 late_initcall(cx25821_alsa_init);
820 module_exit(cx25821_audio_fini);
821
